Energy

The letter J, used as a symbol for the joule, the unit of energy in the International System of Units (SI).

Energy, in physics, is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The unit of measurement in the International System of Units of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of one metre against a force of one newton.

Common forms of energy include the kinetic energy of a moving object, the potential energy stored by an object's position in a force field (gravitational, electric or magnetic), the elastic energy stored by stretching solid objects, the chemical energy released when a fuel burns, the radiant energy carried by light, and the thermal energy due to an object's temperature.

Living organisms require energy to stay alive, such as the energy humans get from food and oxygen. Human civilization requires energy to function, which it gets from energy resources such as fossil fuels, nuclear fuel, or renewable energy.

Dependencies

• Electricity
• Generator
  • Energy
  • Fire
  • Fuel
  • Heat

See also

• Friction

References

This article uses material from the Wikipedia article Energy, which is released under the Creative Commons Attribution-ShareAlike 3.0 Unported License (view authors).